More than 99% of all the species that have ever lived on our planet are now extinct, and while the majority of these die-offs can be attributed to competition or failure to adapt, many perished during dramatic cataclysmic events. The fossil record shows us that these mass extinctions seem to occur periodically in cycles of approximately 26 to 30 million years—which, interestingly, is similar to the amount of time it takes our sun to bob up and down through the galactic disc and cross the center line of the Milky Way.
This region, known as the galactic plane, is crowded with clouds of dust and gas which could disturb space debris within our solar system and send some hurtling towards our planet, which would fit in with some of the mass extinctions. However, according to new research, there could be something else at play: dark matter.
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